<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>1+2+1布局</title>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <header class="header">
    <a href="#">我的</a>主页
    <div class="header-right"></div>
  </header>
  <div class="middle">
    <aside class="left-aside">aside</aside>
    <section class="main-section">section</section>
  </div>
  <footer class="bottom">footer</footer>
</body>

</html>